Figure 7-3 S-Parameters of a Two-Port Device
S-parameters are exactly equivalent to these more common description terms, requiring
only that the measurements be taken with all test device ports properly terminated.
S-Parameter
S
11
S
21
S
12
S
22
Definition
b
/a
a
= 0
Input reflection coefficient
2
1
1
b
/a
a
= 0
2
2
1
b
/a
a
= 0
1
1
2
b
/a
a
= 0
Output reflection coefficient
1
2
2
Test Set Description
Forward gain
Reverse Gain
Operating Concepts
S-Parameters
Direction
FWD
FWD
REV
REV
7- 21